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Research on Spatial Data Infrastructure of Digital City

CAI Jian-de Mapping Product Quality Monitoring Station,Zhengzhou,He'nan,450003  
With the research and application of new technology of modern geodetic surveying,based on original coordinate materials and level gravimetric materials of the city,an high-accuracy urban 3D basic control map integrated with plane,elevation and gravity field is constructed.Combining urban continuous operational satellite positioning service system with high-accuracy quasigeoid,the urban spatial data infrastructure constructive level will be improved.In this paper,it is presented the method and problem of constructing the continuous operational satellite positioning service system and the high-accuracy quasigeoid.
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